first commit

internal/db/db.go

@@ -0,0 +1,41 @@
+package db
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type DB struct {
+	Pool *pgxpool.Pool
+}
+
+func Open(ctx context.Context, connString string) (*DB, error) {
+	cfg, err := pgxpool.ParseConfig(connString)
+	if err != nil {
+		return nil, err
+	}
+	cfg.MaxConns = 10
+	cfg.MinConns = 1
+	cfg.MaxConnIdleTime = 5 * time.Minute
+
+	pool, err := pgxpool.NewWithConfig(ctx, cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("db ping failed: %w", err)
+	}
+
+	return &DB{Pool: pool}, nil
+}
+
+func (d *DB) Close() {
+	if d.Pool != nil {
+		d.Pool.Close()
+	}
+}